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Sad to leave it behind.

A post shared by Grant Gustin (@grantgust) on

Many of us fell in love with Grant Gustin all the way back in 2012 when he played the openly fabulous characterSebastian Smythe on Glee. Since then Grant has found fame by playing The Flash on roughly fifty-five differentDC Universe series. It turns out that Grant's real superpower is his amazing ass, which he just flashed on Instagram! OH, so that's why he's called The Flash!

Grantposted the pic to say goodbye to his exotic beach vacation, and we're not the only A-listers to take notice. His Arrow costar Stephen Amell wrote:

I might not be straight anymore.

AndStephen's cousin Robbiechimmed in with:

New phone background.

Boys boys! there's enough Grant to go around. And if that ends up happening... film it. JK lol?

The Flash Star Grant Gustin Just Showed His Perfect Smooth Butt On Instagram

The Flash Star Grant Gustin Just Showed His Perfect Smooth Butt On Instagram